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Tribulus Terrestris has been shown in a number of controlled studies to have no effect of serum testosterone levels, which is one of the main advertised benefits of the plant.

I am a medical professional, and a powerlifter. I take a number of dietary supplements, provided they are proven effective in controlled studies. I was very sceptical when I read the claims that Tribulus "boosted" testosterone, but I felt I'd give it a try for a month, and I noticed only gastrointestinal symptoms, which were less than desirable (I had an upset stomach).